Re: [Qemu-devel] [PATCH] monitor: avoid moving cursor during "mouse_button" command

[Brad Hards <bradh@frogmouth.net>]

On Thursday 28 April 2011 20:46:25 Gerd Hoffmann wrote:
> I think it would be much better to keep track of the mouse position (and
> button state while being at it) in input.c instead of monitor.c.
> 
> Once this is in place it should be easy to add kbd_mouse_* functions
> which update position or buttons only, which the monitor code can use
> then to avoid the unwanted pointer warp.
This turns out to be a bit more difficult than we discussed.

The new functions work well for the monitor code side (not unexpected, since 
its essentially the same as the original code I proposed for monitor-only 
changes).

The problem is that almost all input code (in absolute mode) keeps track of 
the position itself - monitor was the exception.

So a sequence like the following:
1. Move cursor in SDL
2. Use mouse_move in monitor
3. Use mouse_button 2 in monitor
4. Click mouse in SDL
works ok up to step 3, but step 4 causes the pointer to warp back to where it 
was at the end of step 1.

So it looks like we'd have to modify all callers of kbd_mouse_event(), and the 
code paths are already a bit convoluted. As discussed on IRC, I'm a bit 
concerned about testing cocoa and spice.

Thoughts?

Brad